I recently purchased a new western mountaineering sleeping bag (Puma MF) from Moosejaw. Long story short, I found that the bag was manufactured more than 4 years ago, in 2014, the price tags have faded to yellowish color, and the storage sack (not the compression sack) smells like an old library book.
Naturally, the fact that the bag is 4 years old despite being new throws me off a bit due to the high price hence the high expectation.
The indecision is whether I should return the sleeping bag? The main concern here is the old bag will have a shorter lifespan and provide worse insulation than a recently manufactured counterpart. Please let me know whether my concerns are unfounded.